view tests/test-gendoc.t @ 17970:0b03454abae7

ancestor: faster algorithm for difference of ancestor sets

One of the major reasons rebase is slow in large repositories is
the computation of the detach set: the set of ancestors of the
changesets to rebase not in the destination parent. This is currently
done via a revset that does two walks all the way to the root of
the DAG. Instead of doing that, to find ancestors of a set <revs>
not in another set <common> we walk up the tree in reverse revision
number order, maintaining sets of nodes visited from <revs>, <common>
or both.

For the common case where the sets are close both topologically and
in revision number (relative to repository size), this has been
found to speed up rebase by around 15-20%. When the nodes are farther
apart and the DAG is highly branching, it is harder to say which
would win.

Here's how long computing the detach set takes in a linear repository
with over 400000 changesets, rebasing near tip:

Rebasing across 4 changesets
Revset method: 2.2s
New algorithm: 0.00015s

Rebasing across 250 changesets
Revset method: 2.2s
New algorithm: 0.00069s

Rebasing across 10000 changesets
Revset method: 2.4s
New algorithm: 0.019s

Test document extraction

  $ "$TESTDIR/hghave" docutils || exit 80
  $ HGENCODING=UTF-8
  $ export HGENCODING
  $ { echo C; find "$TESTDIR/../i18n" -name "*.po" | sort; } | while read PO; do
  >     LOCALE=`basename "$PO" .po`
  >     echo
  >     echo "% extracting documentation from $LOCALE"
  >     echo ".. -*- coding: utf-8 -*-" > gendoc-$LOCALE.txt
  >     echo "" >> gendoc-$LOCALE.txt
  >     LC_ALL=$LOCALE python "$TESTDIR/../doc/gendoc.py" >> gendoc-$LOCALE.txt 2> /dev/null || exit
  > 
  >     # We call runrst without adding "--halt warning" to make it report
  >     # all errors instead of stopping on the first one.
  >     echo "checking for parse errors"
  >     python "$TESTDIR/../doc/runrst" html gendoc-$LOCALE.txt /dev/null
  > done
  
  % extracting documentation from C
  checking for parse errors
  
  % extracting documentation from da
  checking for parse errors
  
  % extracting documentation from de
  checking for parse errors
  
  % extracting documentation from el
  checking for parse errors
  
  % extracting documentation from fr
  checking for parse errors
  
  % extracting documentation from it
  checking for parse errors
  
  % extracting documentation from ja
  checking for parse errors
  
  % extracting documentation from pt_BR
  checking for parse errors
  
  % extracting documentation from ro
  checking for parse errors
  
  % extracting documentation from ru
  checking for parse errors
  
  % extracting documentation from sv
  checking for parse errors
  
  % extracting documentation from zh_CN
  checking for parse errors
  
  % extracting documentation from zh_TW
  checking for parse errors